161345533 has 2 divisors, whose sum is σ = 161345534. Its totient is φ = 161345532.

The previous prime is 161345497. The next prime is 161345539. The reversal of 161345533 is 335543161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135559449 + 25786084 = 11643^2 + 5078^2 .

It is a cyclic number.

It is not a de Polignac number, because 161345533 - 2¹⁷ = 161214461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161345495 and 161345504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161345539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80672766 + 80672767.

It is an arithmetic number, because the mean of its divisors is an integer number (80672767).

Almost surely, 2^161345533 is an apocalyptic number.

It is an amenable number.

161345533 is a deficient number, since it is larger than the sum of its proper divisors (1).

161345533 is an equidigital number, since it uses as much as digits as its factorization.

161345533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 31.

The square root of 161345533 is about 12702.1861504231. The cubic root of 161345533 is about 544.4010849160.

Adding to 161345533 its reverse (335543161), we get a palindrome (496888694).

The spelling of 161345533 in words is "one hundred sixty-one million, three hundred forty-five thousand, five hundred thirty-three".